WTF?! OPK showed 🚫 on CD8, now "😁" on CD9?

Freaking flashing smiley this morning. I'm so confused. I log my cycles and opk results religiously every month, and Glow said I'd be "green" starting CD10 (tomorrow), and hit peak around CD14. AF just finished Sun/Mon, so I start testing Wed (yesterday). Negative. Good. I'm ahead of the O cycle. Today. PEAK?! Grabbed husband before he could get in the shower for work and did the baby dance. Logged my results, and now Glow says my fertile window started Monday?! CD6 for gods sake?! So I've already missed it?? This is frustrating.